C# 判断站点是否被ping到

        //实例化ping 对象
        System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping();
        try
        {

            System.Net.NetworkInformation.PingReply res = ping.Send("www.baidu.com");
            if (res.Status != System.Net.NetworkInformation.IPStatus.Success)
            {
                //请求失败
            }
            else
            {
                //请求成功
            }
        }
        catch (Exception ex)
        {
            //请求失败,发生异常
        }